Refer to the Common Unit Systems page for further information. The intent of this site is to provide a convenient means to convert between the various units of measurement within different systems, as well as to provide a basic understanding of the systems currently in use, and how they interact.

Although SI is intended for global use, it has not been fully adopted, and some other systems of measurement are still used in parts of the world. You can also access currency exchange rates dating back to January 1990. You can convert world currencies, precious metals, or obsolete currencies. Currently, the global standard of measurement is the International System of Units (SI), which is a modern form of the metric system. To use OANDA’s free currency converter, type into the relevant field currency names, 3-letter ISO currency symbols, or country names to select your currency. In human history, various unit systems were developed and used in different regions and cultures. Other quantities can be expressed as a multiple of the unit. Unit Converters - Full Versions Common ConvertersĪ unit is a measurement of a quantity that is defined or adopted by tradition or law.

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